Implement support ticket system with role request and bug report functionalities

- Introduced a new support ticket system allowing users to submit bug reports and role requests.
- Implemented endpoints for creating, updating, and managing support tickets, including file attachments.
- Enhanced Telegram bot integration to handle role requests directly within the bot, enabling admins to approve or reject requests without accessing the website.
- Updated database schema to include support ticket entities and their relationships.
- Improved API documentation to reflect new support ticket endpoints and their usage.
- Added necessary localization for support ticket features in both Russian and English.

backend/src/PnvPanel.Application/Support/GetTicket/GetTicketQuery.cs

@@ -0,0 +1,6 @@
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Application.Common.Models;
+
+namespace PnvPanel.Application.Support.GetTicket;
+
+public sealed record GetTicketQuery(Guid TicketId) : IQuery<Result<TicketDetailDto>>, IRequiresActivation;

backend/src/PnvPanel.Application/Support/GetTicket/GetTicketQueryHandler.cs

@@ -0,0 +1,26 @@
+using Microsoft.EntityFrameworkCore;
+using PnvPanel.Application.Auth;
+using PnvPanel.Application.Common.Interfaces;
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Application.Common.Models;
+
+namespace PnvPanel.Application.Support.GetTicket;
+
+public sealed class GetTicketQueryHandler(
+    IAppDbContext dbContext, IIdentityService identityService, IRoleService roleService, ICurrentUser currentUser)
+    : IQueryHandler<GetTicketQuery, Result<TicketDetailDto>>
+{
+    public async Task<Result<TicketDetailDto>> Handle(GetTicketQuery query, CancellationToken cancellationToken)
+    {
+        if (currentUser.UserId is not { } userId)
+            return Result.Failure<TicketDetailDto>(AuthErrors.Unauthorized);
+
+        var ticket = await dbContext.SupportTickets.AsNoTracking()
+            .FirstOrDefaultAsync(t => t.Id == query.TicketId && t.UserId == userId, cancellationToken);
+        if (ticket is null)
+            return Result.Failure<TicketDetailDto>(SupportErrors.NotFound);
+
+        var dto = await TicketMapping.ToDetailDtoAsync(dbContext, identityService, roleService, ticket, cancellationToken);
+        return Result.Success(dto);
+    }
+}